FORMULA FOR LAPPING.



  1. Formula for lapping in reinforcement at tensile zone is 48d+600 mm (where d as dia).
  2. Formula for lapping in reinforcement at compression zone is 40d.
    Where d is the diameter of Rod.
    If we consider 12mm dia rod at column section for lapping,
    Then the lapping length at column section should be = 40X12 = 480mm = 0.48m = 19 inch.